Unison said it has been given permission by the High Court to seek a judicial review over employment tribunal fees put in place today.
The introduction of punitive fees for taking a claim to an employment tribunal would give the green light to unscrupulous employers to ride roughshod over already basic workers' rights.
The Government should not put a price on justice.
Unison's judicial hearing will be held in October.
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The 20-year-old was found fatally wounded on Roth Walk, near Finsbury Park, north London at around 3am on Saturday, Scotland Yard said.
Daniel Cowell has been jailed for five years and four months after ramming a police patrol car with a stolen transit van.